import java.util.Scanner;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class code2 {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);

        int n = in.nextInt();
        int[] arr = new int[n];
        for(int i=0;i<n;i++) {
            arr[i] = in.nextInt();
        }
        int[] dp = new int[n+1];//以i为结尾的最大子数组和

        int ret = Integer.MIN_VALUE;
        for(int i=1;i<=n;i++) {
            dp[i] = Math.max(dp[i-1],0) + arr[i-1];
            ret = Math.max(ret,dp[i]);
        }

        System.out.print(ret);
    }
}